I would prefer at least 15 slicers over FQ but otherwise seems quite good.

最高です！！
Android版Firefoxでも使えます。
PC・Android共に愛用しています。

No perceptible difference in audio volume no matter what you do

Although the mono feature I got this for works, it breaks the HTML5 speed controls such as built into YouTube or from the Global Speed extension.

No perceptible effect. Ubuntu Fossa Firefox 76.9 Canonical 1.0

Quite good. not the best

Good

Nice, but it does not work fine in every sites. E.g. it makes silent movies and audio files on archive.org and similar sites. I have to disable, waiting for a better version.

works as intended. im using it to boost sound on udemy videos works really well :)